I would add that you should test your fill water and if it has a similarly high CH level, then the only other option is to use a water softener, but it's a huge task for a large volume of water (i.e. would need lots of recharging frequently). Well water is often high in CH and some people have "whole house" water softeners. If you get a pool with an initial CH that is good, but have fill water with high CH, then using a water softener on the fill water is reasonable -- but for an entire pool with already high CH it's difficult.

Richard